Hollub has nearly 35 years of experience in the oil and gas industry, holding a variety of technical and leadership roles, both in the US and internationally. In 2013 she was appointed vice-president of Oxy and executive vice-president, US operations, Oxy Oil & Gas (OGJ Online, Oct. 11, 2013). She previously served as executive vice-president, California operations; and president and general manager, Permian basin operations.